Decay of a microsecond seniority 3 isomeric state in ${}^{155}\mathrm{Hf}$

Journal Article · 03 September 2024 · Physical Review. C

DOI: https://doi.org/10.1103/PhysRevC.110.034303 · OSTI ID:2439498

Alayed, B.; Page, R. D. ; Joss, D. T.; Uusitalo, J.; Qi, C.; Briscoe, A. D.; AlAqeel, M. A. M.; Andel, B.; Antalic, S.; Auranen, K.; Ayatollahzadeh, H.; Badran, H.; Barber, L.; Beeton, G.; Birova, M.; Bogdanoff, V.; Cubiss, J. G.; Cullen, D. M.; Deary, J.; Forsberg, U. ; Grahn, T.; Greenlees, P. T.; Hilton, J. B.; Illana, A.; Joukainen, H.; Judson, D. S.; Julin, R.; Jutila, H.; Keatings, J. M.; Labiche, M.; Leino, M.; Lewis, M. C.; Louko, J.; Luoma, M.; Martel, I.; McCarter, A.; McKee, P. P.; Mosat, P.; Nathaniel, S. N.; Neuvonen, O.; O'Donnell, D.; Ojala, J.; Page, C. A. A.; Plaza, A. M.; Pakarinen, J.; Papadakis, P.; Parr, E.; Partanen, J.; Rahkila, P.; Romero, J.; Ruotsalainen, P.; Sandzelius, M.; Sarén, J.; Saygi, B.; Smallcombe, J.; Smith, J. F.; Sorri, J.; Sullivan, C. M.; Szwec, S.; Tann, H.; Tolosa-Delgado, A.; Uusikylä, E.; Venhart, M.; Waring, L. J.; Zimba, G.

Excited states in the neutron-deficient nuclide ${}^{155}\mathrm{Hf}$ have been investigated in experiments performed at the Accelerator Laboratory of the University of Jyväskylä. The ${}^{155}\mathrm{Hf}$ nuclei were produced in fusion-evaporation reactions induced by beams of 295 and 315 MeV ${}^{58}\mathrm{Ni}$ ions bombarding an isotopically enriched ${}^{102}\mathrm{Pd}$ target and separated using the recoil mass separator MARA. An isomeric state having a half-life of 510(30) ns was discovered and is interpreted as a seniority $\upsilon =3, (\pi h_{11/2}^2\otimes \nu f_{7/2})27/2^{-}$ configuration. The $\gamma$ -ray transitions emitted in the deexcitation of the isomeric state to the ground state were identified and a level scheme was constructed, from which the excitation energy of the isomer was determined to be 2581.5(10) keV. A $B\left(E2\right)$ value of 0.45(3) W.u. was deduced for the 105.4 keV transition depopulating the isomeric state. The deduced level scheme and $B\left(E2\right)$ value are compared with systematics and shell-model calculations. Published by the American Physical Society 2024

• Sponsoring Organization: USDOE
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 2439498
• Journal Information: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 3 Vol. 110; ISSN PRVCAN; ISSN 2469-9985
• Publisher: American Physical SocietyCopyright Statement
• Country of Publication: United States
• Language: English